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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4daf600949eb1aadbb5ecc825c0a78b4514ba80fa4b9fc239fd11ebc7a4b49d6' 
  AND token = 'vV7Gbe5yTl9wWkWqq4sqD5EQbEC7CbIYuOvjs1/iGsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}